It's possible to test positive for cannabis on a drug test even if you haven't used it for some time.

你依然可能会在检查的时候呈叶子阳性，当你有段时间不玩叶子以后。

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In November last year the Wigan rugby league player Terry Newton became the first professional sportsman to test positive for HGH and received an automatic two-year ban.

在去年十一月，维甘橄榄球队队员特里·牛顿成为第一个人体生长激素测试呈阳性的职业球员，他也因此受到两年自动禁赛的处罚。

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Technically it is possible to come up with a positive home pregnancy test this week but who wants an unreliable result?

严格来说，这一周你可能用家用怀孕试纸检测出阳性，但谁想得到一个不可靠的结果呢？

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Former Dubai Gold Cup winner Opinion Poll was another horse to test positive.

CNN: SHARE THIS

The supermarket said it was the fourth of its products to test positive for horsemeat contamination.

BBC: David Cameron: Lessons to learn on horsemeat scandal

But those arrested in Manhattan were the most likely to test positive for cocaine, and the second most likely to test positive for heroin.

ECONOMIST: Drug abuse